Nikon N1538 Reference Manual page 225

To Use Description
To zoom in on faces detected by
camera, press P and select Face zoom
(0 199). This option is available only if
faces are detected. If faces are
P detected when the RGB histogram
Zoom in on faces
(0 190) display is zoomed in, Face
zoom will be available in the P-button
menu (Trim, however, will not be
available).
Rotate command dial to view same
View other location in other images at current
images zoom ratio. Playback zoom is
cancelled when a movie is displayed.
Cancel zoom and return to full-frame
Cancel zoom
playback.
Press the K button or press the
Return to
K /
shutter-release button halfway to exit
shooting mode
to shooting mode.
197
Playback and Deletion